Well, March 26th was a Thursday, so it is correct so far.

To change this settings, go to Project Settings, Language Pairs, Chinese to English, Translation Memory ... Auto Substitution -> Dates and Times and change to this:

Chunyi Chen

I think your problem first of all stems from Studio not providing the option you need for your long date.  Studio attempts to provide this:

Looking at this I don't think there is an option to get you what you're after (I'm guessing at what this should be and assuming en(US) - zh(TW)):

2020年3月27日，星期五
2020年3月26日，星期四
2020年3月25日，星期三

It looks as though the days are missed off.  So the result is the AP is correct, insofar as it doesn't care about the actual day... which seems wrong to me.  I'll question this with support.

Then the issue is exacerbated because your problem is that you have attempted to force a translation by writing in the translation you want, and as Studio sees the source as a recognised date it takes your translation and repeats it as a 100% match, which is clearly wrong.

I don't believe you can fix this in the settings suggested because none of them provide you with what you need.  Your best bet is to use the Terminjector or the Regex AutoSuggest Provider because you won't be able to benefit from AP here anyway, so at least you can get some help with the typing.  I'd recommend you filter on the dates and tackle them first, then lock them.