pictures size changes without the code changes

i own a website www.joyceinternational.com and i upload most of my pictures in image format of 400X400 or similar size. but in Internet Explorer some of pictures appear 1000X800 instead of my original size, some of the pictures do not respond to my code which they respond to my code before ( may be year ago which i cannot remember ). now it is getting worse, the picture get bigger and bigger without my changing my codes. the codes are the same the whole website. the original code which Mozilla Firefox works ok but not in Internet Explorer!

here is the link in category that stay with limit of 400X400
http://joyceinternational.com/itemlistings.php?category=Part_2_stroke_Eton_Engine_Scooter

here is the link in same category that blow big without changing the codes
http://joyceinternational.com/itemlistings.php?category=Part_2_stroke_Eton_Engine_Scooter&s=84&p=12

i do recognize there are some notes after scooter “&s=84&p=12” which is not part of my scripts, are these from virus?

here is what we want it to look like in Mozilla Firefox
http://joyceinternational.com/itemlistings.php?category=Part_2_stroke_Eton_Engine_Scooter

any help?

:’(

do you need the codes to provide help?

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