Unwanted line break in content fields

Hello,

I keep getting unwanted line breaks when I insert a content tag. For example...

Code:
<p>Ipsum lorem dolor<singleline label='MyLabel'>my text</singleline>sit amet<p>

Renders:

Ipsum lorem
MyLabel
sit amet

I can't seem to get the singleline to continue on as one line of text.

Help?
Best,

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