Unusual faulty touch screen fix

So this is a bit of a weird one. I have had a broken/cracked screen on my Huawei p20 lite for a while now, it has recently been causing issues whereby applying pressure will cause multiple false touches to be registered in many different areas of the screen.

Now just recently I have gotten a little cooking oil on my fingers and accidentally got some on my screen. Weirdly, the issue of false touches registering has gone away immediately.

What do you think is the mechanism that has caused this problem to fix itself? I am still going to replace the screen when I can but it is interesting nonetheless.