Same transaction in two valid block

[apierr]

Can a transaction be in two valid blocks?

Sometimes transactions seems to land in two valid blocks.
See the tx 0x0c447d... which appears inside the block 6819126 and 6819132.

for f in output-tx/*; do  grep 0c447d0 $f -l;  done
output-tx/6819126-0c447d0
output-tx/6819132-0c447d0