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As others have said, if they're limiting the number of approvals you can make on your ballot, then that's not how approval voting is supposed to be administered.

If they're just adding up each candidate's votes, that's not how approval is supposed to be tabulated in a multi-winner context (which is more complicated); see https://en.wikipedia.org/wiki/Proportional_approval_voting

if X is a fixed number, then it's not approval voting. In approval voting, there is no limit, either minimum or maximum, on the number of candidates you can vote for. If X is limited, then you get something a bit more like plurality voting, since the spoiler effect is in play.

That's not approval voting. If X is equal to the number of open seats that's literally just the definition of multiple winner plurality voting.

Approval voting is a single winner system.

Approval voting means you can vote for as many as you want. It sounds like you're talking about at large plurality voting.