Change of Product Description has been applied to Collection Page

[VickieLS]

I have changed the short description on a product and this has led to the style of description changing on the collection page? You can see that the description on the collection page for the product I have updated has changed to red and has much more text showing than the other products on the page. 

How do I change the short description on a product without it changing the style on the collection page? I just want the collection page to show the first few words like it does for the other products?