Pale Ale All Grain, FG not achieved

I would like your input as to why my FG was far from the theoric on from brewer's friend calculator.

All Grain Pale Ale:

• Maris Otter 4.7k
• Roasted Barley 94 gr
• Chinook 12 aau min 60
• Cascasde 5 auu min 5
• S-04 re-hydrated in one cup of water at room temperature

Batch Size 20L
- Wort: 12.9L
- water ph:6-7 I didn't have the machine yet, only with the papers
- Sparge:14.7L
- ph_wort_preBoil: 6
- ph_wort_postBoil: ~5

I use brewer's friend calculator and got these numbers for theory:
- OG_theory:1.053
- FG_theory:1.013

These are my real gravity numbers:
- OG_real:1.058
- FG_real:1.027

I use refractometer with ATC to meassure gravity.

Fermenting temperature was between 18°C and 22°C. I didn't have any problems during boil temperature-wise

From what I read, it could be the yeast so I was hoping you will have any input as to why I didn't get closer to the FG (I understand theory is only theory but still I'm far I think)

Thanks!