Padre Pio´s ancient chapel

Does anybody out there knows why there is only a fixed altar at Padre Pio ancient chapel in San Giovanni Rotondo, Italy?
Having been there last November I was quite surprised to see it, but also I enjoyed the Mass only Ad Orientem.
As far as I know, this wasn´t so after the death of Padre Pio?Why and when did they take the free-standing altar?

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