Okay, Please, 2 more ways and let me know about the result:
1) Browse your shop under private (incognito) tab and edit/save product. Then check it in FO.
2) Try to clear cache of PrestaShop manually.
2.1 -> enter folder list of ps > var. There is cache folder. rename it.
2.2 -> create empty these folders again. I have marked them in image: https://jmp.sh/HHu7RLp
Then check the result again.