by the way, 0x1fe00 is an ambigous value. if you don't specify the full 8 bits the software tends to pad the zeros itself. hdinsttools pads the zeros to the end, so it becomes 0x1fe00000 while hdtoolbox pads them to the beginning giving 0x0001fe00. be careful.
Actually the value itself isn't ambiguous at all, but hdinsttools. :-)
That is clearly a bug in the app, numbers should never be zeropadded from the right.
It's 8 nibbles btw, not 8 bits.