What is your operating system?
What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
Can you repeat the problem? If so, what are the steps?
(Please be specific and use the names as seen in Shotcut, preferably English. Include a screenshot or screen recording if you can. Also, you can attach logs from either View > Application Log or right-click a job and choose View Log.)
Putting “Size and Position” above “Chroma Key” causes the filter to break.
How it should look like:
How it looks like when “Size and Position” is above “Chroma Key” in filters