Problem is in your if [[...]] expression where you are using 2 grep commands without using command substitution i.e. $(grep 'pattern' file).
However instead of:
if [[ grep $check_val1 $log -ne $check_val1 || grep $check_val2 $log -ne $check_val2 ]]; then
You can use grep -q:
if grep -q -e "$check_val1" -e "$check_val2" "$log"; then
As per man grep:
-q, --quiet, --silent
Quiet mode: suppress normal output. grep will only search a file until a match
has been found, making searches potentially less expensive.
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