One thing to check is your downspouts and where they empty. Most have no splash blocks and most are a foot or less away from the slab. Heavy rains, let alone sustained tropical rains for hours on end push a very large volume of water down the spouts.
Not all direct the water sufficiently far enough from the house.
Long story....sustained water volume is able to get under the slab or between the slab and the house framing (and even blocks).
I have put extenders (available home depot/lowes) on all our downspouts taking the water 3 feet away from the base of the house.
Just one thing to check.
Do you have a double exterior door? Very frequently a direct driving rain will come between the doors.
Just to name a couple.
Good luck.
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