Hi @Anonymous,
Do you use ',' (comma) as decimal separator on your region?
The Decimal separator character in PowerApps is dependent on the language. Some regions of the world use "." as a decimal separator while others use ",".
Please check the following article for more details:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/global-apps
When using PowerApps Studio for web (web experience), the language used is provided by the browser. Most browser default to the host operating system's setting with some also providing a way to set the language manually.
Please check if you have set the language of your browser to Swedish. Also please take a try to set the language to Swedish for your host operating system.
Please take a try to set the X property of the Icon control to following:
280,5 /* <-- instead of 280.5 */
If the issue still exists, please consider submit an assisted support ticket through the following link:
https://powerapps.microsoft.com/en-us/support/pro/
Best regards,