[Elecraft] KAT500 question

[jsdroyster at nc.rr.com]

Our KAT500 (used with K3 and KPA500) seems to have forgotten its correct memories for the 20 m band or maybe developed new erroneous memories. It gives me 14 to 1 on autotune.  If I set it on manual and do a tune it reads 1.2 to 1.  So here is the question:  if I do manual tunes every so many MHz across the band will those go into memory, or is  the memory based only on autotunes? 

Also, any idea how this happened?

THANKS!
Julie KT4JR