This is a cross platform thing so I delete device info, it is NOT specific to web. Telegram's markdown is fundamentally problematic. It should actually offer users these:
Purely WYSIWYG (such as Microsoft Word) editor without converting any symbols to formatting at all
the best: give users ability to switch between the options above.
What Telegram currently has is just a horrible MIXTURE of option 1 and option 2 and it is completely unacceptable, some messages are simply impossible to write for example:
Log in here to report bugs or suggest features. Please enter your phone number in the international format and we will send a confirmation message to your account via Telegram.