Calculated Value not matching field type Number

OK, another observation … if I type in any value in Avg CLB field, that value is automatically overwritten by the correct calculation.

This makes me believe that the afterUpdate hook is running fine!

However, now I see that nothing is written to Avg CLB field automatically. All other fields show data inserted from the sliders, but Avg CLB is left blank after ‘submit’ action??

PS: I tried the hook of afterInsert which didn’t do anything