A picture would help. But if the bottom layer (and only the bottom layer) is underextruded as you describe then maybe your bed needs to move closer to the nozzle. You want to have a good squish on the bottom layer or the part will come off or at least corners will lift off.
Also the bottom layer tends to print much faster volume (0.3mm typically versus 0.1mm for the rest of the layers typically) so you may just be printing too cold or too hot. But more likely it's a leveling issue.
The gap can also be partly caused by backlash/play. Especially if it's not symmetrical. Here's more about backlash and gaps between wall and infill:
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burtoogle 516
It would help hugely if you could a) attach an image showing the gap between the bottom layer and the wall and b) attach the curaproject.3mf for the print (or even the gcode file). Thanks.
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