BTC_TEST network fee is increased very high (starting from 0.0002691 based on request amount 0.0001)

Developer Discussion
1

Recently fireblocks sandbox has increased the network fee for BTC_TEST coin dynamically based on the amount:
{
“asset”: “BTC”,
“originalAmount”: “0.0001”,
“networkFee”: “0.0002691”,
“netAmount”: “-0.0001691”
}
{
“asset”: “BTC”,
“originalAmount”: “0.001”,
“networkFee”: “0.0003575”,
“netAmount”: “0.0006425”
}

The network fee is supposed to be the same regardless of request amount. it was working perfectly before - the network fee was constantly 0.00009165 regardless of request amount. But now the behaviour is completely changed. Please advise.

Thank you.
Night Kimura