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A lot of people place the mask strap too high on their head so the mask gradually pulls up against the base of the nose causing the mask to curve outwards and break the seal on each side of the base of the nose. Try to ensure that the mask on the upper lip is not pressing on the base of the nose.
Yes, I know when my mask strap is too high on my head coz it's starts to cause pain at the base of my nose. I also notice it if I'm doing wall drift diving, taking lots of photos in a vertical position as the mask pulls up somewhat.