The white or brown aluminum channel screwed to the concrete floor is blocking the waters exit. Doesn't seem like it would, but it does.
Next time it rains, take note of the deepest part. After it dries out again, loosen the 3-4 screws next to that deepest part a couple of turns. Beneath the channel put something thin that won't rot or rust like a nickel or whatever you have around to hold the channel off the concrete a little bit.
Re-tighten the screws. Bugs still cannot get in and it takes maybe 5-10 minutes and costs a nickel.
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