I can only reproduce this if I do sub calculations like:
1+1<enter>
*2<enter>
If I now alternate between <ctrl-z> and <enter> I get the successive results: "2*2", "8", "2*2", "16", "2*2", "32", ... , and not the expected succession of "2*2", "4", "2*2", "4", ...
Successive <ctrl-z><enter> sequences seems to calculate ((1+1)*2)*2, (((1+1)*2)*2)*2, ((((1+1)*2)*2)*2)*2, ...
Obviously there is an error in the code somewhere.
I can only reproduce this if I do sub calculations like:
1+1<enter>
*2<enter>
If I now alternate between <ctrl-z> and <enter> I get the successive results: "2*2", "8", "2*2", "16", "2*2", "32", ... , and not the expected succession of "2*2", "4", "2*2", "4", ...
Successive <ctrl-z><enter> sequences seems to calculate ((1+1)*2)*2, (((1+1)*2)*2)*2, ((((1+1) *2)*2)* 2)*2, ...
Obviously there is an error in the code somewhere.