I know this is wrong. But could you explain to me why, and how should I fix this? It’s impossible that the displacement map would look like this.
First thing to do when you have yourself this question : how is the coherence map ? Can you share it with us ?
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I agree with @qglaude, this pattern is very likely caused by bad phase quality, indicated by low coherence.
Have you seen this tutorial? Sentinel-1 TOPS interferometry It contains remarks on fringes, coherence and unwrapping for displacement mapping.
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Never noticed it was revised. Really great 
thank you. We are currently revising many of the existing SAR tutorials and plan to add new ones as well. Currently, these are the ones:
- DEM generation with Sentinel-1 - Workflow and challenges
- Sentinel-1 Stripmap Interferometry (DEM generation)
- Sentinel-1 TOPS Interferometry (Displacement mapping)
- Interferometry Tutorial with Radarsat-2 (DEM generation)
- Command Line InSAR processing
- Synergetic use of radar and optical data
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@ABraun Thank you for updating the tutorials. Great job! I hope this will answer most of the questions in the forum.