VBA Code - multiple cell loop to txtbox Question/Problem

Hello -

I'm using the following code:

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But for some reason the text box (txtComments) only displays the 1st, 2nd, 4th, 7th, 11th, 16th (and continuing in series) entries.

I'm afraid I've baffled myself, can someone point out what I'm doing wrong?

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Removing the "c" variable fixed this. Not sure why.