Post font changes

Im having since yesterday some kinda font changes after few replys.
Text gets bold/italic (see image) and none of the user did make the text bold or italic.



I did not change anything on forum for like 3 weeks now.

Thx in Advance

what is the problem? its the user who changed the font

sorry text typo, i meant none of my user did make the text bold or italic.
The text changes from normal text to bold/ italic after few replys from user.
I lookt into there post and none did use html or bbcode.
the first 2 post are fine then it becomes bold/italic

Hmm..The bold text happen for me on many forums, but i don't know how or why. sorry .

Could anyone help solve this issue? Getting these random bold/italic after few replys from users. Its fine till some point then it gets suddenly bold/italic.
Even tho I did not change anything on forum. I would gladly appreciate some kinda of help.