How to Resolve - Creating New Conditional Formatting Rule Instead Replaces Existing Conditional Formatting Rule?

Creating New Conditional Formatting Rule Instead Replaces Existing Conditional Formatting Rule

I use Conditional Formatting from time to time -- often enough that I'm generally familiar, but infrequently enough that I would not consider myself an expert by any means.
I usually use the Formula option to customize the Conditional Formatting.
I am
certain that what is happening now is something new and weird to me.
I hope I'm doing something wrong that someone here can help me identify, but I can't imagine what it is -- this sure seems like a bug, where my spreadsheet has somehow become corrupted.

Today, every attempt to add an additional Conditional Formatting Rule to my spreadsheet is instead replacing an existing Conditional Formatting option.
There are currently 2 Rules that I added a few weeks ago.
I am now trying to add the third.
This only seems
to happen to this spreadsheet, not to others.
It is in a table, if that matters.
It always replaces the first Rule, meaning that if I change the order of the Conditional Formatting Rules, whichever one is first is the one that gets overwritten.
The existing
rules apply to all rows in the table (but not all columns).

No error messages, no other indications of any problems.

What could be causing this and how can I solve this to add a new Conditional Formatting Rule? If this is working as designed, what situation would cause any New Conditional Rule to instead replace an existing Rule without any warning or error message?

Thanks for any help,
Colin

Solutions to the Problem Creating New Conditional Formatting Rule Instead Replaces Existing Conditional Formatting Rule

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Never mind, I'm a moron.
But I hope others can learn from my foolishness before they similarly post a question like this.
When entering a new rule, it automatically changes the "Show formatting rules for:" drop down to "Current Selection." It was adding
my new Rule every time, just that it was also changing displayed Rules, which happened to always hide one of the other Rules.
I misinterpreted this as it replacing another Rule.

I do think it would be better from a UI/UX perspective, if it did not change the viewing list when adding a new Rule.
At least for me, it never occurred to me it would do that.
A view change when not requested by the user is jarring and likely to lead to this
kind of confusion.

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