Custom translation doesn't apply to checkout

[mraw]

Hello everyone!
I've been encountering this issue and I was curious if anyone else had it and if/how was it resolved:

- I've set a default language for my store (romanian). Everything is great so far.
- Made some modifications to my product page under Themes / Edit language. Great again.
- Then tried to edit some messages from checkout page (for example, adding 'optional' next to Zip Code. Great again.

Until yesterday. Now here it began to be interesting. If I go to checkout using Firefox (incognito or regular), i see Zip Code.
If i go to checkout using Chrome (incognito or regular), i see Zip Code (optional).

Sometimes, i see Zip Code (optional) in Firefox incognito also - at some point i was able to replicate that by waiting a bit longer from the moment i added something to cart to the moment i went to checkout but that stopped working as well - i only see the default Zip Code now in Firefox.
- I tried clearing browsing data, cookies, everything.
- I tried from mobile, same thing. I get Zip Code on Firefox and Zip Code (optional) on Chrome.
- I tried on Chrome from work and i get Zip Code.
- Started a chat with a Shopify agent to ask if they know anything about this and they saw Zip Code. Then i got a recommendation to reach out to a Shopify Expert so chat didn't help much either.

Yesterday i added google analytics to theme.liquid so i removed that thinking that was the issue - no change.
Anyone got any suggestions?
Thank you!