Prompting message show if criteria does not work when the targeted column has suggested value

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I have a Text message displaying on the form when a selected course has reached it's capacity.

The selected course column is refering the course database which stores course Name and Term & whether it has available spot or not.

It's working as intended when there's no suggested values.

The problem is,

when I limit the suggested value of the selected course to Term 4 in the database, the text message prompting won't work properly. It's just keep displaying itself no matter what I choose in the selected course.

My guess it that the suggested value works as prefilled data disregarding the selected course is a single-selection value. Here's the formula that I put in the show if part of the Text message.

Can anybody point me a way that I could have my suggested value set-up and this prompting message working at the same time?

Thank you for your time.