Please help Im seeing errors getting worse

I reported in a thread earlier this weekend where in I was seeing charactures in the script/text of posts at first it was one thread title and was inermittant now its constant and in titles and text and avatar locations to the left of posts. Again these shapes are as follows

a minature TM sign for trade mark

a symbol something like the sign for the euro dollar best described as a sideways SI symdol or deformed e

and a with the ^ mark above it

and appears mainly in words like can't don't won't ect basically any word that ends with 't can this be fixed it's sometimes distracting to see recursive errors when trying to read long posts