Multiple E-RAB Requests Without Receiving Modification Confirm

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While realizing SgNB Addition, first eNB initiates path update procedure by sending E-RAB Modification Indication for bearer with ID 5 but MME doesn’t send E-RAB Modification Confirm message, instead it sends E-RAB Setup Request for bearer with ID 6. Then it sends another E-RAB Setup Request for bearer with same ID without receiving an answer for first one. After the second request, eNB sends E-RAB Setup Response. But still eNB doesn’t receive any Modification Confirm message in the rest of flow and I couldn’t understand why.