Looks like a composite door to me , therefore both the threshold and metal ' drip bar ' are perfectly correct for the product and the actual parts won't be the issue BUT as has been stated I suspect that the threshold hasn't been sealed to the concrete correctly, if at all.
First thing to check is that the compression of the door is correct and the handle is always pulled up to engage the full compression , otherwise water will seep around the seals in heavy wind and rain. Check whether you are getting water ' sitting ' in the aluminium threshold, if not the door seals are fine and it's probably the seal under the threshold.
Another thing to watch out for on composite doors is they are known to leak water from the letter box and the glazing cassette and run down the inside of the door sash, A quick bead of clear silicone across the top of the letterbox , and around the glazing cassette ( where the ' cassette moulding ' meets the glass ' ) should solve this.
I find it hard to believe its condensation, unless you are drying washing on radiators or running a vented tumble dryer within the property but if that were the case all windows/doors would be running with condensation.
Course of action , in my opinion ....
1- check for standing water in threshold , check drainage holes in threshold if water is collecting, if clear then investigate how well the door is sealing
2 - if no standing water , check all exterior silicone seals around the door, especially that of the aluminium threshold meeting the concrete ( probably best to renew all visible sealant to make sure
3 - check/watch for water ingress from the letterplate/glazing cassette and seal with clear silicone if needed.
There are two more possibilities albeit slightly less likely, one that there is a leak in the building above the door somewhere and it's permeating down and two , the exterior render/concrete is porous