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Hello @reiner-schwope,
Thank you for contacting support.
If you are using our Image SEO module to control the titles from the images, you can change the current settings under WordPress Dashboard > Rank Math > General Settings > Images.
From there you can change the variables that you are using to add the missing title tag and remove the last one which is likely causing this.
Don’t hesitate to get in touch if you have any other questions.