Why only the contact names are imported without the numbers?

I have a weird problem. I had an Elephone P9000 and I saved all my contacts on the sim card. Sadly, they weren't synced with Google (I had no idea). Now, that phone is broken. When I transferred my SIM card to LG K10 and imported the contacts, all of them imported but only 7 of them were with numbers. The rest of them are just the name of the contact and when you open it, it's empty.
The 7 that correctly imported, were the ones I entered in the last month.
I tried to find an answer for this on the internet, but nothing works.
Has anyone experienced something similar?

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