On a 1993 Fadal VMC 4020 with CNC 88 control. Why is the Z axis moving when a tool length offset is specified e.g. M6 T1 H1? It does this with no other commands and with or without a fixture offset active. In fact, in MDI mode, if you simply type H1 - H21 it moves Z to the amount specified in the corresponding number of the tool offset table. Same problem when running a program, which will crash for sure as the X,Y is not always in the correct position for machining during a tool change. BTW the tool changer works fine and has none of the common problems.
Second question which may or not be related. Why is the tool in the spindle always followed by a .25664? For example it will say TOOL 1.25664 IS IN THE SPINDLE. The offset table does not reflect this annoyance.

Thanks in advance for any help with these issues!