Wrong altitude meters in Garmin Connect app once drawing a route.

Hi,

When I draw a route in Garmin Connect, the shown altitude meters are not right. For example I drew a route and the connect app says it’s 784 altitude meters. I knew this couldn’t be right and afterwards it was only 264 in practice. How is this possible? And how can I fix this. It’s hard to draw a route to unknown places in this case. Hopefully someone can help me out. Thanks in advance.

Kind regards,

Mart