In the 1.5 Snapshots, comparators have a feature in which in default state, they will not repeat the same signal strength if the signal going into one or both sides.

The bug I am facing is that the comparators do not lock if it is being repeated and then a stronger signal strength goes into the side.

~~_{Reproduction Steps}~~
1) Place down a comparator
2) Feed a powered signal into the back of the comparator (a weak signal works best)
3) Place a wire on either side and send power directly into the side of the comparator. Do not add any additional wire to the side to optimize reproduction
//You will note that the repeated signal strength remains constant
~~_{End of Reproduction Steps}~~

At this point you can mess around with it but the main points are these:
-When one or both sides are stronger and having a constant signal feeding in, the repeated signal will NOT lock until the source strength is updated (block updates do nothing)
-When locked and having still a constant signal feeding in, when the sides are depowered, the output will NOT turn on until the source strength is updated
-The locking problem is not directional based nor is it side specific

I can provide video evidence, but I am attaching pictures with time stamps.

Hope this helps!