If you need more information on how to format numbers, you can have a look at our help article
on this topic.
On the other hand, if there is a problem with this functionality, can you send me a sample page that reproduces the issue, so I can inspect it on my side?
In addition, it will be very helpful if you can provide me with more information on the following things:
- Do you use English culture for the page and do you need to support other cultures as well?
- Is there a ClientTemplate or a DataFormatString set for the labels of the series?
The above details and the testing page will allow me to give you further assistance on the matter, so your effort will be highly appreciated.
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