If you have any doubts about the English written content on your website, there is a good reason. When people suspect there is something wrong or doubtful about their word-choices, they're almost always correct -- and here is why:
Humans have an instinctive grasp of language; it's what our brains evolved to do -- communicate! We also tend to recognise when it feels "wrong".
Just as one example: Non-native English speakers are not used to a continuing tense (also known as a non-finite verb or gerund). They know past,presentand future tenses, but it is almost unique to English to use "-ing". Instead they use : "I went to the store;I go to the store; I will go to the store". There are very few languages that integrate the idea of "going to the store" -- a description of an event from the past, through the present and on into the future.
It is said that English is not a language of "rules" so much as it is a language of "Exceptions to the Rules". Well, I know the rules AND the exceptions, and I can fix you website's English.