Order stuck set at pending instead of processing

[ghost]

Hello,

I am using Magento 2.2.6 and your module.

The orders works fine and IPN too the log I receive are those :
[2019-08-05 18:56:21] main.DEBUG: Order 000000133: Standard IPN [] []
[2019-08-05 18:56:21] main.DEBUG: Order 000000133: Change status to processing [] []
[2019-08-05 18:56:21] main.DEBUG: Order 000000133: Le paiement a été autorisé et capturé par Verifone e-commerce. [] []
[2019-08-05 18:56:21] main.DEBUG: Order 000000133: Capture for 75.500000 [] []
[2019-08-05 18:56:21] main.DEBUG: Order 000000133: Customer is back from Verifone e-commerce payment page. Payment success. [] []

The status should be updated according to the log and the code is fine with the logs.
The problem is that it comes back under the state pending...

Also i checked and your code use depreciated methods such as order -> save
Since you are using the model and not the interface is that correct ?

I hope of a reply, my client is using your solution and that is very problematic since it doesn't update the dashboard causing various issues with the accounting.