Inaccurate Altitude readings

I have noticed this with multiple planes. However it is inconsistent in that sometimes it will have an inaccurate reading and other times it will, even if the inaccurate reading was in the same plane previously.

The person I am following(MisterNix), his altitude reading is correct. You can tell my altitude reading is way off. I think it’s reading 400 feet lower than what it should read.

There are several threads here on the issue.
Here is a link to one of them

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