Google sheet graph, incorrect time format in the chart

I created a Google sheet that groups many values. One of them is a formatted time value hh: mm: ss AM / PM, obtained with the following formula:

= TIMEVALUE (SUBSTITUTE ("April 28, 2019 at 14:03", "to", ""))

However, these values ​​are not displayed correctly in the chart:

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Apparently, I can not find a way to customize the time format in the graph … How should I fix this problem?