Attribute names are appearing overlaid on values

I use a block for my room names that has the room number attribute in a rectangle, then two room name attributes (ROOM-1 and ROOM-2) each on a line following that rectangle. Here is how it is supposed to look in a typical room:



Here ROOM-1 has the value "DOUBLE" and ROOM-2 has the value "233 SF".

I have been using this system for a long time with no problems. But today, one of my drawings (that has also had these blocks in it for a long time) started showing them this way:



What looks like overlaid blocks is in fact just one block but with the attribute names overlaid on the values given in each room. I tried copying just one of these room name blocks to an empty drawing, and this problem still occurs. Is this a bug or some setting that I have inadvertently changed? I am using version 25.2.05 but have not updated since it came out, and this problem started well after my last update.

Thanks for any advice!