WordPress quote problem

When I select Quote in WordPress (5.5.3) Blocks the feature seems to have changed.

It used to present inserted text in large blue capitals. Now it appears in small grey upper and lower case (not in itself a problem) but in preview and live page it comes out in very small grey text, never in the red or at usable font size I have set in Theme Panel. Nor are any of the other Quote Styles looking correct – all have the text too small.

This problem only occurs with new posts. Quotes in existing articles look fine, e.g. – https://jazzjournal.co.uk/2020/11/05/heart-full-of-rhythm-ricky-riccardi-on-satchmos-middle-years-2/

Have WordPress changed something? I have changed no settings. I am using NP 10.3.6.1.

Thanks
Mark

Further to this I see that hitting Quote no longer generates the same code:

<!– wp:quote {“quoteStyle”:”td_quote_box td_box_left”} –>

<p>’…if there’s anything that I think differentiates my band than other bands is just the sheer amount of joy'</p>

<!– /wp:quote –>

Now it’s:

<!– wp:quote {“className”:”is-style-default”} –>

<p></p><cite>’…if there’s anything that I think differentiates my band than other bands is just the sheer amount of joy'</cite>

<!– /wp:quote –>