This is due to how symbols in CC3+ work.

When you place a new symbol in your map, the symbol definition for that symbol is stored in the map, and every copy you place of the symbol reference that definition. However, the identifier for each definition is the name of the symbols. So, what is happening here is that you already have a definition in your map for Pine Trees 1, which you got when inserting the SS1 trees. Now, when placing the same named symbol from another style, CC3+ just sees that this definition already exists in the map, and uses that one (There can't be two definitions with the same name, so if it had copied it anew, it would have overwritten the old one, replacing all existing symbols in the map instead)

To work around this, you can rename the SS1 definition in the Symbol manager (Symbols menu), or just delete it outright if you don't have any trees from the SS1 style placed. Deleting a definition with symbols existing in the map will delete all references from the map.

Hit Tab (while moving something). That changes how cursor previews are rendered.

This is due to a corrupted entity in the drawing. There is an ellipse with a negative area there. Just delete it and the drawing should be fine.

To delete it, use :CC2ERASE:

When asked for a selection, then type in #104753 on the command line and hit enter. The command line should say that 1 entity is selected. Do it.

The #-character here is to tell CC3+ that you want to select by entity tag number, and the number itself is the tag of the corrupted entity, as shown by list.

To find this misbehaving entity, I went through the sheets 1 by 1 to see when the zoom failed. That would be the sheet the entity was on, walls hubs in this case. Then, I just started deleting entities from that sheet until the zoom stopped failing. In this case, it still failed even after deleting all the entities on the sheet, so I did a List on (A)ll, and that revealed the entitiy.

Note that to recover from a corrupted zoom like this, as long as you have any text in your map, right clicking any of the zoom buttons, and picking To All Text, and then picking one of the text entries in the box will get you back to a normal zoom level where the zoom out/in buttons work again. In the case of a corrupted entity like here, the zoom extents button won't be working untill the entity is found and dealt with though.

For scaling, I prefer non-visual scale for scenarios like this.

First measure the size of a hex in the image using Info-distance. Try to find points to make this as precise as possible. This is the source size. For my example here, let us assume this is 0.8

Now, measure the the distance on the CC3+ hex grid. Make sure to measure it in the same way, for example between two corners of the hexes. This is the destination size. For my example here, let us assume this is 1.93

Now, just right click :CC2SCALE:, select non-visual scale, set the origin point to somewhere. When the command line asks for the scale, simply type in source size/destination size, i.e 0.8/1.93 straight on the command line, no need to manually calculate it, and then hit enter.

You can move it with non-visual move much the same way. Just figure out how much it needs to move, and then give the distance as @distx,disty. The @-sign here refers to relative cooridnates instead of absolute ones. (Although in this case, perhaps it might be eaasier to just move them to an absolute position)