Text size changes in posts

[Loserise]

http://gimmeamovement.blogspot.com/

Hi,

After publishing my posts the text in some of the posts change size.
And even if I go back and try to edit it in the post it doesn´t
change. And the text size "Normal" or "Small" seems to vary from time
to time. Has it got anything to do with if you publish links or
pictures there?

Any tips will be very appreciated!

Louise