I presume that you do not use a US-English (en-us) keyboard. Obsidian seems to know only the en-us keyboard layout for some special characters. Try using the key that has the desired function on the en-us keyboard. If the key you want is what I think, try shift-6 on your keyboard. This should produce the ^ sign.
Please resubmit this bug report and make sure that: 1) you follow the bug report template, 2) you use the default theme (no css) and 3) there are no third-party plugins enabled (You can use the help vaul t for 2 and 3).