Abnormal temperatures at the top and bottom of the MDEA acid gas regeneration tower

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I’ve run into a problem recently and I’m hoping experts can help me out. LNG project: MDEA circulation rate of 5.5 m3/h, tower diameter of 600 mm. Initially, the acid gas removal process by driving the system was successful: the carbon dioxide level was below 50 ppm. The internal components of the regeneration tower were properly packed, with a bottom temperature of 110°C and a top temperature of 87°C; the operating pressure was 50 kPa. After stopping and starting again, the carbon dioxide level is not within the acceptable range. There is little difference in the temperatures at the top and bottom of the regeneration tower; the acid gas levels in the gas exiting the absorption tower do not meet the required standards, but no issues were found with the liquid distributor. Dear experts, what could be the possible reasons? Thank you