Using Safari when I open board and especially threads it shrinks font size

This just started up yesterday and continues today. Might be ad related?

When I open the board its in correct font size. Then sometimes but not always it just goes poof and shrinks font. Same when opening a thread. It doesn’t reload it just goes from normal font size to smaller font size

When I use safari reload page button it usually fixes problem but sometimes it shrinks back again. Note: Never does this while creating a post, only in view mode

It seems it’s when an ad pops up on top or bottom but I can’t tell what ad. Once it shrinks it’s hard to read and when pinch to make bigger you then have to scroll side to side to read.

Also to note, I use iPhone but never had this issue until I believe yesterday.