I've tested most of my meters. Sourced 1A into the current terminals, confirmed by switching to the current function and then switched to DCV and went through the ranges.
Only DMM6500 has this problem, above 10V range 25mV becomes 2.5V.
Other DMMs (2 x 3458A, K2001, K2015, 34401A) usually on lower ranges behave as nothing is connected (collecting charge) and on higher ranges are close to zero, both are to be expected.