Cabin in Gunnison County, Colorado

I have an old cabin built in 1951 that is standing at elevation 8917 ft. I had a guy put on a tin roof the kind that already looks weathered to replace the old shingles that were on it from years past. When inspecting his work, I realized that the screws were poking through inside the cabin. The inside is all knotty pine and the ceiling as well, so the aesthetics are completely compromised. If it were just a couple but totally on the one side and then he must of realized and he got shorter screws for the other side of roof. So no screws coming through. My question is this - do I need to worry about leakage? Is there a remedy? Any suggestions or thoughts are appreciated. Thank you.

Thank you so much for your prompt response. A couple more questions. One side is completely fine & the other side has about two rows 30 ft long. Do you think replacing those with just a little thicker, shorter screw would be ok..as it would be an easier fix. Also, what could be the downfall or fallout of problems done that way?? Is there any possibility of leaking? Thanks.