DMM Autoranging Scale

[acceler8]

I have a Tenma 72-7730  (looks like a Uni-T UT71B clone.)  It has always been a little funky with the Autorange in Ohms mode.  For example, measuring a 100 ohm resistor that is 101.7 ohms will read as .1017 K ohms.  It is the same for the Meg-ohm scale (101.7 K ohm will read 0.1017 M ohm).  In fact, the only time it chooses the right scale is if the resistor is under 100 Ohms.

Is there anything I can do to fix this?  Is this a common problem?  I tried searching, but I couldn't seem to come up with the magic combination of terms to find this problem.

[Wytnucls]

The UT71B behaves normally, only changing scales when the resistance is higher than the 20,000 count.
For instance a 150 Ohm resistor will read as 149.47 Ohm and a 220 Ohm resistor as 0.2172k Ohm.