Nearly 73,000 Rohingya refugees have entered Bangladesh since last October, when government forces in Myanmar unleashed a bloody crackdown on the Muslim minority. Many told horrific stories of villages being burned and women gang-raped.
Most headed to the already overcrowded refugee camps of Cox's Bazar, Bangladesh's main tourist resort district which borders Myanmar.
The influx led Dhaka to resurrect a controversial plan to relocate refugees to an undeveloped island in the Bay of Bengal.
Community leaders told AFP more than 5,000 Rohingya had now returned to the Buddhist-majority nation despite the risk of persecution.
"They chose to die by bullets than to be killed by nature," community leader Noor Hafiz said.
"People became very concerned after they learnt about the relocation plan. We heard the island submerges during the monsoon. Now we can only hope the situation back home is better."
Hafiz said 3,000 people had left his camp, while another 2,000 people had left two separate newly-built makeshift refugee camps.
"They said they don't want to die in flash floods," said Dudu Mia, a Rohingya who heads another camp called Leda.
The Bay of Bengal is frequently hit by cyclones. Rights groups have dismissed the plan to populate the island of Thengar Char with refugees as "ridiculous".
Nonetheless the Bangladesh government has ordered the construction of a jetty, helipad and visitor facilities on the 6,000-acre (2,430-hectare) island.
Last week it began a Rohingya headcount as part of its relocation campaign after seeking international support for the plan.
Bangladesh says some 400,000 Rohingya are now living in squalid conditions at refugee camps in the country, although most predate the recent unrest in Myanmar.
A Border Guard Bangladesh official also said growing numbers of Rohingya were returning, although he gave a much lower figure.
"Last month 48 refugees notified us they were leaving Bangladesh for home," Teknaf Major Abu Russell Siddique told AFP.
"This month, in a week, the number has reached 235."
Siddique said parts of Myanmar's Rakhine state, where most of the country's Rohingya live, were now stable.
"As far as we know, only people from the villages which were unaffected (by the crackdown) are returning," he said.
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