my logitech dinovo keyboard suddenly is weird as some keys type strange combos

using onscreen at present

here are examples in case anyone knows what causes this

i have unplugged,new batteries,cleaned,rebooted,scanned,checked settings etc

for g it types gt

for 0 [0

legt4 me gt4rhy7 gt4o gt4hy7pe a sengt4ence

that is 'let me type a sentence'

weird

any clues?