i saw two types of 'ch' wanna know more about this

[compact crest]

are both ch used or its some problem of the website from which im learing hangul

[woven tundra]

different fonts i believe but same pronunciation
u dont write it like this on paper tho as theres a different way, see #《🦥│intro-to-hangeul

[median anchor]

those are the same letter yes

ㅊ