Wedge on bottom of exterior door

The door on our 2022 Heartland North Trail has been difficult to open and close since we got it last year. We found this siliconed to the bottom of the entry door about an inch away from a scew hole. Once removed the door is a lot easier to use. Questions are:

1. What is it for?
2. Why was it attached with silicone away from the hole instead of screwed in?
3. Should we put it back?20230909_135244.jpg
 
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